Field Calibration - GPI TM Series Operation Manual

OPERATION
Batch and Cumulative Totals
The meter maintains two totals. The Cumula-
tive Total provides continuous measurement
and cannot be manually reset. The Batch
Total can be reset to measure flow during a
single use. The Cumulative Total is labeled
with TOTAL 1 LOCKED indicating that this
total is locked and cannot be manually
zeroed. Batch Total is labeled with TOTAL 2.
When the Cumulative Total reaches a
maximum reading of 999,999, it will auto-
matically reset to zero.
Press the DISPLAY button briefly to switch
between the batch, cumulative total, and
flowrate.
NOTE: Totalization counts total units without
differentiating between gallons, litres or
field calibrated units.
Flowrate Feature
When this feature is activated, the word
FLOWRATE displays to the left on the bottom
line.
When FLOWRATE is displayed, the numbers
on the middle line reflect the rate of flow, for
example, the current gallons per minute
(GPM) or liters per minute (LPM).
Display FLOWRATE
To use this feature, press and release
DISPLAY until FLOWRATE appears to the left
of the bottom line.
Activate the Meter
Turn the meter ON by starting water flow or
briefly pressing the DISPLAY button. The
meter will display the Batch or Cumulative
Total from last use.
Press DISPLAY briefly to display the Batch
Total. Hold the DISPLAY button down for 3
seconds to reset the Batch Total to zero.
The meter is programmed to turn off auto-
matically if not used for 4 minutes.
2
Factory and Field Calibration Curves
All calibration information is visible to the
user as words in the upper part of the
display, above the numeric digits.
All units are configured with a "factory"
calibration curve, for which units of gallons or
litres may be selected by the user ("GAL" or
"LTR" will be visible). This curve is NOT user
adjustable: the word "PRESET" is displayed
to show this. (The factory calibration is stored
permanently in the computer's memory.)
The "field" calibration curve may be set by
the user, and can be changed or modified at
any time using the calibration procedure
described below in the Calibration Section.
Totals or flowrate derived from the field
calibration are visible when the field calibra-
tion setting is selected ("CAL B" will be
visible on the top line).
Selecting a Different
Calibration Setting
You can switch between GAL and LTR
modes at will without "corrupting" totalizer
contents. For example, the computer can
totalize 10.0 gallons. If the user switches to
LTR mode, the display will immediately
change to "37.50" (the same amount in units
of litres). GAL / LTR switching also works in
FLOWRATE mode.
To select a different calibration setting, first
press and hold the CALIBRATE button.
Continue to hold it while also pressing and
releasing the DISPLAY button. (You may then
also release the CALIBRATE button.) The flag
indicators in the top line of the display will
change to show the newly selected calibra-
tion setting. Calibration settings change in
this order: GAL, LTR, CAL B, GAL, etc. While
fluid is flowing, only the GAL and LTR selec-
tions may be made. However, when NO fluid
flow is occurring, any setting may be selected.

Field Calibration

Factory calibration settings are custom-
programmed into each flowmeter during
production, using water at 70°F (21°C).
Readings using the standard factory
calibration curves may not be accurate in
some situations – for example, under
extreme temperature conditions.